Business Statistics For Contemporary Decision Making 8th Edition By Black - Test Bank

File: ch02, Chapter 2: Charts and Graphs

True/False

1. A summary of data in which raw data are grouped into different intervals and the number of items in each group is listed is called a frequency distribution.

Ans: True

Response: See section 2.1 Frequency Distributions

Difficulty: Easy

Learning Objective: 2.1: Construct a frequency distribution from a set of data. 

2. If the individual class frequency is divided by the total frequency, the result is the median frequency.

Ans: False

Response: See section 2.1 Frequency Distributions 

Difficulty: Medium

Learning Objective: 2.1: Construct a frequency distribution from a set of data. 

3. A cumulative frequency distribution provides a running total of the frequencies in the classes. 

Ans: True

Response: See section 2.1 Frequency Distributions   

Difficulty: Medium

Learning Objective: 2.1: Construct a frequency distribution from a set of data. 

4. The difference between the highest number and the lowest number in a set of data is called the differential frequency.

Ans: False

Response: See section 2.1 Frequency Distributions   

Difficulty: Medium

Learning Objective: 2.1: Construct a frequency distribution from a set of data. 

5. For any given data set, a frequency distribution with a larger number of classes will always be better than the one with a smaller number of classes. 

Ans: False

Response: See section 2.1 Frequency Distributions

Difficulty: Medium

Learning Objective: 2.1: Construct a frequency distribution from a set of data. 

6. One rule that must always be followed in constructing frequency distributions is that the adjacent classes must overlap.

Ans: False

Response: See section 2.1 Frequency Distributions

Difficulty: Medium

Learning Objective: 2.1: Construct a frequency distribution from a set of data. 

7. An instructor made a frequency table of the scores his students got on a test

      Score                                   Frequency

                30-under 40                                         1

                40-under 50                                         4

                50-under 60                                         5

                60-under 70                                        10

                70-under 80                                        20

                80-under 90                                        10

                                        90-under 100                                        5

The midpoint of the last class interval is _________.

a) 90

b) 5

c) 95

d) 100

e) 50

Ans: c

Response: See section 2.1 Frequency Distributions 

Difficulty: Easy

Learning Objective: 2.1: Construct a frequency distribution from a set of data. 

8. An instructor made a frequency table of the scores his students got on a test

      Score                                   Frequency

                30-under 40                                         1

                40-under 50                                         4

                50-under 60                                         5

                60-under 70                                        10

                70-under 80                                        20